Ignition device for internal-combustion engines.



F. SGHRTBR:

IGNITION DEVICE FOR INTERNAL GOMBUS'FION ENGINES.

APPLICATION PILE-D JULY 3.1913.

/NVEN Tof? iim solidify- .i x'eia'ies to spark Sts upon the discovactiv@Substances The Pw, whifzh facu D oi' the spark, are wipes fm. consumedby the ay of the spark pmmnml wiieii are guided under mv i il has Deeli'uunfl hzit 15h@ proporis mamfesi Libie s@ substances und this iacciai-ding to me pms/ent iive 'iL/ion, ws: rif e Central poi@ piece ffthe formed for @Xzuilpie as a small so-Cnled active .subin a mold, andis so aropposie pole om da laitier heated condif t is matter of @nai amare siuck becmiducoi's at a point of Vfrise the gas bethe Ehe S LECCOHI-bo''h pdfs 'i i i'medmit mi' l10n-n i up of cundv becoma pzirizi'.imperative the @were wfeeii two lea " @es becomes haar-Sed by mlljzbreaks, when iis is the psincipie of own hom-b w med lightning Lr- VI ition 0i spark is Nacogiaiiy i e, and die Upper portion of the Ce'iAeXeem-ofi@ upii in'i'iioh he spark ikilalVS, is mari@ of metal so tmWl1ii'e-1ie lower p01'- timiis mad@ mC motiv-e material upon Aiiifgh iiemw' struck, die upper porting. upon which the an; zdmos immediatelyplays a is mniimined ioi' :i ifmgler peiiqc', i iiibd out of u mimi]'which nu withstand h@ 'action of ho withrmt nmtei'iai ini iii-e phi);of the :irc upon n s iiioiium oi y izimps.. ma.

nasmilcii iis drawing the metallic present invention this difficulty isobviated 'by moving a new portion of the central rod into the arc area,as it is consumed by the play of the arc. This may be automaticallyaccomplished by the pressure ot a spring which t'eeds the rod into thearc area as it is consumed.

Referring to the illustrative embodiment of my invention shown in theaccompanying body vot the spark plug is brought into electricalvengagement with the explosion cylinder through the threaded sectionscrewed into the cylinder head; The high tension current is led to thecentral electrode through the rod d insulated by the sleeve e. To insurethe jump of the spark between the electrodes proper, a skirt f ofinsulation is provided as usual. The rod d carries at its lower end abushin b within which is fitted the central pole piece a which ispressed outward against the abutment i by the spring h. As the lowerportion of the pole piece is consumed, the upper portion isautomatically fed downward by the spring it. At the lower end of thebody or" the plug two downwardly extending arms E are provided whichcarry the three-quarter. ring c constituting the other pole of the plug.This ringis beveled on its lower Jlace so as to present an edge at itsinner periphery at such a height that after the striking of the arcbetween it and the pole `piece a, the aro passes at once to the conicalportion if of the center contact and outward. and upward thereon untilit breaks. The pole iz and the conical portion c of the center contactmay be made out of or covered with suitable metal which will withstandthe play et the spark without material injury It would of course be nodeparture 'from the scope of the present invention, to construct in themanner described not only the central electrode which is connected tothe high tension apparatus at the moment of the ignition of the gases,but also the outer pole which is in electrical engagement with the headof the explosion cylinder,-a construction which is readily effectedwithout further explanation than has already been given. While perhapssomewhat diilicult to manufacture and expensive, it is easilyconceivable. Similarly, the invention would be embodied in aconstruction in which by the use of a magnetic field in welll knownmanner, the arc may be shifted from the active substance on which it isstruck to the metallic portion of the plug, in substantially the samemanner as above described. Such a construction appears to beentirelysuperfluous however. since the comot' the plug which is` aowbastion gases` themselves on explosion have a strong upward drivingaction on the arc, which is suliicient to elect the desired result.

`l claim as my invention:

l. A spark plug having an electrode comprising a. conductor of thesecond class having at high temperature an ionizing action on theadjacent gas traversed by the spark, and a juxtaposed metallic portionupon which the arc plays after its .torniation. I

2. A spark plug having an electrode comprising a conductor of the secondclass having at high temperature an ionizing action on the adjacent gastraversed by the spark,

and a superposed metallic portion upon which the arc plays after itsformation.

3. A spark plug having an electrode comprisinga conductor of the secondclass having at high temperature an ionizing action on the adjacentgastraversed by the spark, and a juxtaposed inetalli'c portion to whichthe arc automatically moves after its formation upon said substance.

4l. A spark plug having an electrode coinprisingjy a conductor of thesecond class .having at hightemperaturean ionizing action on theadjacent gas trarersed by the spark, and a juitaposed metallic portionupon which the arc, plays after its formation, said conductor or" thesecond class being movably mounted in the plug whereby it may be tedinto the arc area consumed, substantially as described.

5. A sparlrv plug having an electrode comprising a. conductor of thesecond class having at high temperature an ionizing action on theadjacent gas traversed by the spark,

and a juxtaposed metallic 'portion upon which the arc plays alter itsformation, said conductor of the second class comprising a movable bodyand means to automatically feed the latter into Athe arcare'a asconsuined.

6. A" spark plug` having an electrode comprising a conductor of thesecond class having at high temperature an ionizing action on theadjacent gas traversed. by the spark, and a juxtaposed metallic portionupon which the are plays after its formation, said conductor ot' thesecond class cornprising a movable body and spring means toautomatically feed the latter into the arc area as consumed.

in testimony whereof l have signed my., naine to this specification, inthe presence ofI two subscribing' witnesses.

FRITZ' SCHRTER.

1Witnesses f HENRY lrl'ssrrm, Tomi-:MAR HAUPT.

